Home / 20,878.25-31,302.50-9,778.86

Finding the Fourth Proportional to 20,878.25, 31,302.50 and 9,778.86

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Solution

The fourth proportional to 20,878.25, 31,302.50 and 9,778.86 is: 14,661.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,878.25 : 31,302.50 = 9,778.86 : x
  2. Step 2: Convert to fraction form
    20,878.25/31,302.50 = 9,778.86/x
  3. Step 3: Cross multiply
    20,878.25x = 31,302.50 × 9,778.86
  4. Step 4: Simplify right side
    20,878.25x = 306,102,716.26
  5. Step 5: Solve for x
    x = 306,102,716.26/20,878.25
  6. Step 6: Final answer
    x = 14,661.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.